I like the way you think.
Thanks, man.
It's certainly not impossible.
1) In the leaked Sony emails, Pascal acknowledges a "Marvel/Fox" crossover that they (at a minimum) believed was going to be happening in 2018/2019, which reasonably could have more recently been pushed back to 2020 because of the Spider-Man and Ant-Man-caused schedule adjustments;
2) Marvel's three untitled post-Infinity War movies came at a strange time, when we had already heard about the supposed end to Phase 3, which suggests to me that we're hearing about the beginning of Phase 4, whose announcement was strangely well timed with...
3) The Fox/Marvel TV deal. Sure, Marvel TV and Marvel Studios are different entities in terms of properties available and project discussions, but is it unreasonable to assume that this was the result of a much larger deal made by the higher-ups of both Fox and Marvel, that was then trickled down to Fox TV and Marvel TV, and that the rest of the deal will be revealed in the next year or two leading up to 2020?
This is all speculation. But if I'm right... hooooly, God.